import pygame.font


class Button:

    def __init__(self, settings, screen, message):
        """初始化按键属性"""
        self.screen = screen
        self.screen_rect = screen.get_rect()

        # 设置按钮尺寸和其它属性
        self.width, self.height = 200, 50
        self.button_color = (160, 160, 160)
        self.text_color = (255, 255, 255)
        self.font = pygame.font.SysFont(None, 48)

        # 创建按钮的rect对象，并使其居中
        self.rect = pygame.Rect(0, 0, self.width, self.height)
        self.rect.center = self.screen_rect.center

        # 按钮的标签只需创建一次
        self.prep_message(message)

    def prep_message(self, message):
        """将信息渲染为图像，并在按钮上居中"""
        self.message_image = self.font.render(message, True, self.text_color,
                                              self.button_color)
        self.message_image_rect = self.message_image.get_rect()
        self.message_image_rect.center = self.rect.center

    def draw_button(self):
        # 绘制一个用颜色填充的按钮，再绘制文本
        self.screen.fill(self.button_color, self.rect)
        self.screen.blit(self.message_image, self.message_image_rect)
